source: code/trunk/downstream.go@ 704

Last change on this file since 704 was 704, checked in by contact, 4 years ago

Add timeout for downstream connection registration
File size: 68.8 KB
Line 
1package soju
2
3import (
4 "context"
5 "crypto/tls"
6 "encoding/base64"
7 "errors"
8 "fmt"
9 "io"
10 "net"
11 "strconv"
12 "strings"
13 "time"
14
15 "github.com/emersion/go-sasl"
16 "golang.org/x/crypto/bcrypt"
17 "gopkg.in/irc.v3"
18)
19
20type ircError struct {
21 Message *irc.Message
22}
23
24func (err ircError) Error() string {
25 return err.Message.String()
26}
27
28func newUnknownCommandError(cmd string) ircError {
29 return ircError{&irc.Message{
30 Command: irc.ERR_UNKNOWNCOMMAND,
31 Params: []string{
32 "*",
33 cmd,
34 "Unknown command",
35 },
36 }}
37}
38
39func newNeedMoreParamsError(cmd string) ircError {
40 return ircError{&irc.Message{
41 Command: irc.ERR_NEEDMOREPARAMS,
42 Params: []string{
43 "*",
44 cmd,
45 "Not enough parameters",
46 },
47 }}
48}
49
50func newChatHistoryError(subcommand string, target string) ircError {
51 return ircError{&irc.Message{
52 Command: "FAIL",
53 Params: []string{"CHATHISTORY", "MESSAGE_ERROR", subcommand, target, "Messages could not be retrieved"},
54 }}
55}
56
57var errAuthFailed = ircError{&irc.Message{
58 Command: irc.ERR_PASSWDMISMATCH,
59 Params: []string{"*", "Invalid username or password"},
60}}
61
62func parseBouncerNetID(subcommand, s string) (int64, error) {
63 id, err := strconv.ParseInt(s, 10, 64)
64 if err != nil {
65 return 0, ircError{&irc.Message{
66 Command: "FAIL",
67 Params: []string{"BOUNCER", "INVALID_NETID", subcommand, s, "Invalid network ID"},
68 }}
69 }
70 return id, nil
71}
72
73func fillNetworkAddrAttrs(attrs irc.Tags, network *Network) {
74 u, err := network.URL()
75 if err != nil {
76 return
77 }
78
79 hasHostPort := true
80 switch u.Scheme {
81 case "ircs":
82 attrs["tls"] = irc.TagValue("1")
83 case "irc+insecure":
84 attrs["tls"] = irc.TagValue("0")
85 default: // e.g. unix://
86 hasHostPort = false
87 }
88 if host, port, err := net.SplitHostPort(u.Host); err == nil && hasHostPort {
89 attrs["host"] = irc.TagValue(host)
90 attrs["port"] = irc.TagValue(port)
91 } else if hasHostPort {
92 attrs["host"] = irc.TagValue(u.Host)
93 }
94}
95
96func getNetworkAttrs(network *network) irc.Tags {
97 state := "disconnected"
98 if uc := network.conn; uc != nil {
99 state = "connected"
100 }
101
102 attrs := irc.Tags{
103 "name": irc.TagValue(network.GetName()),
104 "state": irc.TagValue(state),
105 "nickname": irc.TagValue(GetNick(&network.user.User, &network.Network)),
106 }
107
108 if network.Username != "" {
109 attrs["username"] = irc.TagValue(network.Username)
110 }
111 if realname := GetRealname(&network.user.User, &network.Network); realname != "" {
112 attrs["realname"] = irc.TagValue(realname)
113 }
114
115 fillNetworkAddrAttrs(attrs, &network.Network)
116
117 return attrs
118}
119
120func networkAddrFromAttrs(attrs irc.Tags) string {
121 host, ok := attrs.GetTag("host")
122 if !ok {
123 return ""
124 }
125
126 addr := host
127 if port, ok := attrs.GetTag("port"); ok {
128 addr += ":" + port
129 }
130
131 if tlsStr, ok := attrs.GetTag("tls"); ok && tlsStr == "0" {
132 addr = "irc+insecure://" + tlsStr
133 }
134
135 return addr
136}
137
138func updateNetworkAttrs(record *Network, attrs irc.Tags, subcommand string) error {
139 addrAttrs := irc.Tags{}
140 fillNetworkAddrAttrs(addrAttrs, record)
141
142 updateAddr := false
143 for k, v := range attrs {
144 s := string(v)
145 switch k {
146 case "host", "port", "tls":
147 updateAddr = true
148 addrAttrs[k] = v
149 case "name":
150 record.Name = s
151 case "nickname":
152 record.Nick = s
153 case "username":
154 record.Username = s
155 case "realname":
156 record.Realname = s
157 case "pass":
158 record.Pass = s
159 default:
160 return ircError{&irc.Message{
161 Command: "FAIL",
162 Params: []string{"BOUNCER", "UNKNOWN_ATTRIBUTE", subcommand, k, "Unknown attribute"},
163 }}
164 }
165 }
166
167 if updateAddr {
168 record.Addr = networkAddrFromAttrs(addrAttrs)
169 if record.Addr == "" {
170 return ircError{&irc.Message{
171 Command: "FAIL",
172 Params: []string{"BOUNCER", "NEED_ATTRIBUTE", subcommand, "host", "Missing required host attribute"},
173 }}
174 }
175 }
176
177 return nil
178}
179
180// ' ' and ':' break the IRC message wire format, '@' and '!' break prefixes,
181// '*' and '?' break masks, '$' breaks server masks in PRIVMSG/NOTICE
182const illegalNickChars = " :@!*?$"
183
184// permanentDownstreamCaps is the list of always-supported downstream
185// capabilities.
186var permanentDownstreamCaps = map[string]string{
187 "batch": "",
188 "cap-notify": "",
189 "echo-message": "",
190 "invite-notify": "",
191 "message-tags": "",
192 "sasl": "PLAIN",
193 "server-time": "",
194 "setname": "",
195
196 "soju.im/bouncer-networks": "",
197 "soju.im/bouncer-networks-notify": "",
198}
199
200// needAllDownstreamCaps is the list of downstream capabilities that
201// require support from all upstreams to be enabled
202var needAllDownstreamCaps = map[string]string{
203 "account-notify": "",
204 "account-tag": "",
205 "away-notify": "",
206 "extended-join": "",
207 "multi-prefix": "",
208
209 "draft/extended-monitor": "",
210}
211
212// passthroughIsupport is the set of ISUPPORT tokens that are directly passed
213// through from the upstream server to downstream clients.
214//
215// This is only effective in single-upstream mode.
216var passthroughIsupport = map[string]bool{
217 "AWAYLEN": true,
218 "BOT": true,
219 "CHANLIMIT": true,
220 "CHANMODES": true,
221 "CHANNELLEN": true,
222 "CHANTYPES": true,
223 "CLIENTTAGDENY": true,
224 "ELIST": true,
225 "EXCEPTS": true,
226 "EXTBAN": true,
227 "HOSTLEN": true,
228 "INVEX": true,
229 "KICKLEN": true,
230 "MAXLIST": true,
231 "MAXTARGETS": true,
232 "MODES": true,
233 "MONITOR": true,
234 "NAMELEN": true,
235 "NETWORK": true,
236 "NICKLEN": true,
237 "PREFIX": true,
238 "SAFELIST": true,
239 "TARGMAX": true,
240 "TOPICLEN": true,
241 "USERLEN": true,
242 "UTF8ONLY": true,
243 "WHOX": true,
244}
245
246type downstreamConn struct {
247 conn
248
249 id uint64
250
251 registered bool
252 user *user
253 nick string
254 nickCM string
255 rawUsername string
256 networkName string
257 clientName string
258 realname string
259 hostname string
260 password string // empty after authentication
261 network *network // can be nil
262 isMultiUpstream bool
263
264 negotiatingCaps bool
265 capVersion int
266 supportedCaps map[string]string
267 caps map[string]bool
268
269 lastBatchRef uint64
270
271 monitored casemapMap
272
273 saslServer sasl.Server
274}
275
276func newDownstreamConn(srv *Server, ic ircConn, id uint64) *downstreamConn {
277 remoteAddr := ic.RemoteAddr().String()
278 logger := &prefixLogger{srv.Logger, fmt.Sprintf("downstream %q: ", remoteAddr)}
279 options := connOptions{Logger: logger}
280 dc := &downstreamConn{
281 conn: *newConn(srv, ic, &options),
282 id: id,
283 supportedCaps: make(map[string]string),
284 caps: make(map[string]bool),
285 monitored: newCasemapMap(0),
286 }
287 dc.hostname = remoteAddr
288 if host, _, err := net.SplitHostPort(dc.hostname); err == nil {
289 dc.hostname = host
290 }
291 for k, v := range permanentDownstreamCaps {
292 dc.supportedCaps[k] = v
293 }
294 // TODO: this is racy, we should only enable chathistory after
295 // authentication and then check that user.msgStore implements
296 // chatHistoryMessageStore
297 if srv.Config().LogPath != "" {
298 dc.supportedCaps["draft/chathistory"] = ""
299 }
300 return dc
301}
302
303func (dc *downstreamConn) prefix() *irc.Prefix {
304 return &irc.Prefix{
305 Name: dc.nick,
306 User: dc.user.Username,
307 Host: dc.hostname,
308 }
309}
310
311func (dc *downstreamConn) forEachNetwork(f func(*network)) {
312 if dc.network != nil {
313 f(dc.network)
314 } else if dc.isMultiUpstream {
315 dc.user.forEachNetwork(f)
316 }
317}
318
319func (dc *downstreamConn) forEachUpstream(f func(*upstreamConn)) {
320 if dc.network == nil && !dc.isMultiUpstream {
321 return
322 }
323 dc.user.forEachUpstream(func(uc *upstreamConn) {
324 if dc.network != nil && uc.network != dc.network {
325 return
326 }
327 f(uc)
328 })
329}
330
331// upstream returns the upstream connection, if any. If there are zero or if
332// there are multiple upstream connections, it returns nil.
333func (dc *downstreamConn) upstream() *upstreamConn {
334 if dc.network == nil {
335 return nil
336 }
337 return dc.network.conn
338}
339
340func isOurNick(net *network, nick string) bool {
341 // TODO: this doesn't account for nick changes
342 if net.conn != nil {
343 return net.casemap(nick) == net.conn.nickCM
344 }
345 // We're not currently connected to the upstream connection, so we don't
346 // know whether this name is our nickname. Best-effort: use the network's
347 // configured nickname and hope it was the one being used when we were
348 // connected.
349 return net.casemap(nick) == net.casemap(GetNick(&net.user.User, &net.Network))
350}
351
352// marshalEntity converts an upstream entity name (ie. channel or nick) into a
353// downstream entity name.
354//
355// This involves adding a "/<network>" suffix if the entity isn't the current
356// user.
357func (dc *downstreamConn) marshalEntity(net *network, name string) string {
358 if isOurNick(net, name) {
359 return dc.nick
360 }
361 name = partialCasemap(net.casemap, name)
362 if dc.network != nil {
363 if dc.network != net {
364 panic("soju: tried to marshal an entity for another network")
365 }
366 return name
367 }
368 return name + "/" + net.GetName()
369}
370
371func (dc *downstreamConn) marshalUserPrefix(net *network, prefix *irc.Prefix) *irc.Prefix {
372 if isOurNick(net, prefix.Name) {
373 return dc.prefix()
374 }
375 prefix.Name = partialCasemap(net.casemap, prefix.Name)
376 if dc.network != nil {
377 if dc.network != net {
378 panic("soju: tried to marshal a user prefix for another network")
379 }
380 return prefix
381 }
382 return &irc.Prefix{
383 Name: prefix.Name + "/" + net.GetName(),
384 User: prefix.User,
385 Host: prefix.Host,
386 }
387}
388
389// unmarshalEntityNetwork converts a downstream entity name (ie. channel or
390// nick) into an upstream entity name.
391//
392// This involves removing the "/<network>" suffix.
393func (dc *downstreamConn) unmarshalEntityNetwork(name string) (*network, string, error) {
394 if dc.network != nil {
395 return dc.network, name, nil
396 }
397
398 var net *network
399 if i := strings.LastIndexByte(name, '/'); i >= 0 {
400 network := name[i+1:]
401 name = name[:i]
402
403 for _, n := range dc.user.networks {
404 if network == n.GetName() {
405 net = n
406 break
407 }
408 }
409 }
410
411 if net == nil {
412 return nil, "", ircError{&irc.Message{
413 Command: irc.ERR_NOSUCHCHANNEL,
414 Params: []string{name, "Missing network suffix in name"},
415 }}
416 }
417
418 return net, name, nil
419}
420
421// unmarshalEntity is the same as unmarshalEntityNetwork, but returns the
422// upstream connection and fails if the upstream is disconnected.
423func (dc *downstreamConn) unmarshalEntity(name string) (*upstreamConn, string, error) {
424 net, name, err := dc.unmarshalEntityNetwork(name)
425 if err != nil {
426 return nil, "", err
427 }
428
429 if net.conn == nil {
430 return nil, "", ircError{&irc.Message{
431 Command: irc.ERR_NOSUCHCHANNEL,
432 Params: []string{name, "Disconnected from upstream network"},
433 }}
434 }
435
436 return net.conn, name, nil
437}
438
439func (dc *downstreamConn) unmarshalText(uc *upstreamConn, text string) string {
440 if dc.upstream() != nil {
441 return text
442 }
443 // TODO: smarter parsing that ignores URLs
444 return strings.ReplaceAll(text, "/"+uc.network.GetName(), "")
445}
446
447func (dc *downstreamConn) readMessages(ch chan<- event) error {
448 for {
449 msg, err := dc.ReadMessage()
450 if errors.Is(err, io.EOF) {
451 break
452 } else if err != nil {
453 return fmt.Errorf("failed to read IRC command: %v", err)
454 }
455
456 ch <- eventDownstreamMessage{msg, dc}
457 }
458
459 return nil
460}
461
462// SendMessage sends an outgoing message.
463//
464// This can only called from the user goroutine.
465func (dc *downstreamConn) SendMessage(msg *irc.Message) {
466 if !dc.caps["message-tags"] {
467 if msg.Command == "TAGMSG" {
468 return
469 }
470 msg = msg.Copy()
471 for name := range msg.Tags {
472 supported := false
473 switch name {
474 case "time":
475 supported = dc.caps["server-time"]
476 case "account":
477 supported = dc.caps["account"]
478 }
479 if !supported {
480 delete(msg.Tags, name)
481 }
482 }
483 }
484 if !dc.caps["batch"] && msg.Tags["batch"] != "" {
485 msg = msg.Copy()
486 delete(msg.Tags, "batch")
487 }
488 if msg.Command == "JOIN" && !dc.caps["extended-join"] {
489 msg.Params = msg.Params[:1]
490 }
491 if msg.Command == "SETNAME" && !dc.caps["setname"] {
492 return
493 }
494 if msg.Command == "AWAY" && !dc.caps["away-notify"] {
495 return
496 }
497 if msg.Command == "ACCOUNT" && !dc.caps["account-notify"] {
498 return
499 }
500
501 dc.conn.SendMessage(msg)
502}
503
504func (dc *downstreamConn) SendBatch(typ string, params []string, tags irc.Tags, f func(batchRef irc.TagValue)) {
505 dc.lastBatchRef++
506 ref := fmt.Sprintf("%v", dc.lastBatchRef)
507
508 if dc.caps["batch"] {
509 dc.SendMessage(&irc.Message{
510 Tags: tags,
511 Prefix: dc.srv.prefix(),
512 Command: "BATCH",
513 Params: append([]string{"+" + ref, typ}, params...),
514 })
515 }
516
517 f(irc.TagValue(ref))
518
519 if dc.caps["batch"] {
520 dc.SendMessage(&irc.Message{
521 Prefix: dc.srv.prefix(),
522 Command: "BATCH",
523 Params: []string{"-" + ref},
524 })
525 }
526}
527
528// sendMessageWithID sends an outgoing message with the specified internal ID.
529func (dc *downstreamConn) sendMessageWithID(msg *irc.Message, id string) {
530 dc.SendMessage(msg)
531
532 if id == "" || !dc.messageSupportsBacklog(msg) {
533 return
534 }
535
536 dc.sendPing(id)
537}
538
539// advanceMessageWithID advances history to the specified message ID without
540// sending a message. This is useful e.g. for self-messages when echo-message
541// isn't enabled.
542func (dc *downstreamConn) advanceMessageWithID(msg *irc.Message, id string) {
543 if id == "" || !dc.messageSupportsBacklog(msg) {
544 return
545 }
546
547 dc.sendPing(id)
548}
549
550// ackMsgID acknowledges that a message has been received.
551func (dc *downstreamConn) ackMsgID(id string) {
552 netID, entity, err := parseMsgID(id, nil)
553 if err != nil {
554 dc.logger.Printf("failed to ACK message ID %q: %v", id, err)
555 return
556 }
557
558 network := dc.user.getNetworkByID(netID)
559 if network == nil {
560 return
561 }
562
563 network.delivered.StoreID(entity, dc.clientName, id)
564}
565
566func (dc *downstreamConn) sendPing(msgID string) {
567 token := "soju-msgid-" + msgID
568 dc.SendMessage(&irc.Message{
569 Command: "PING",
570 Params: []string{token},
571 })
572}
573
574func (dc *downstreamConn) handlePong(token string) {
575 if !strings.HasPrefix(token, "soju-msgid-") {
576 dc.logger.Printf("received unrecognized PONG token %q", token)
577 return
578 }
579 msgID := strings.TrimPrefix(token, "soju-msgid-")
580 dc.ackMsgID(msgID)
581}
582
583// marshalMessage re-formats a message coming from an upstream connection so
584// that it's suitable for being sent on this downstream connection. Only
585// messages that may appear in logs are supported, except MODE messages which
586// may only appear in single-upstream mode.
587func (dc *downstreamConn) marshalMessage(msg *irc.Message, net *network) *irc.Message {
588 msg = msg.Copy()
589 msg.Prefix = dc.marshalUserPrefix(net, msg.Prefix)
590
591 if dc.network != nil {
592 return msg
593 }
594
595 switch msg.Command {
596 case "PRIVMSG", "NOTICE", "TAGMSG":
597 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
598 case "NICK":
599 // Nick change for another user
600 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
601 case "JOIN", "PART":
602 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
603 case "KICK":
604 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
605 msg.Params[1] = dc.marshalEntity(net, msg.Params[1])
606 case "TOPIC":
607 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
608 case "QUIT", "SETNAME":
609 // This space is intentionally left blank
610 default:
611 panic(fmt.Sprintf("unexpected %q message", msg.Command))
612 }
613
614 return msg
615}
616
617func (dc *downstreamConn) handleMessage(ctx context.Context, msg *irc.Message) error {
618 ctx, cancel := dc.conn.NewContext(ctx)
619 defer cancel()
620
621 ctx, cancel = context.WithTimeout(ctx, handleDownstreamMessageTimeout)
622 defer cancel()
623
624 switch msg.Command {
625 case "QUIT":
626 return dc.Close()
627 default:
628 if dc.registered {
629 return dc.handleMessageRegistered(ctx, msg)
630 } else {
631 return dc.handleMessageUnregistered(ctx, msg)
632 }
633 }
634}
635
636func (dc *downstreamConn) handleMessageUnregistered(ctx context.Context, msg *irc.Message) error {
637 switch msg.Command {
638 case "NICK":
639 var nick string
640 if err := parseMessageParams(msg, &nick); err != nil {
641 return err
642 }
643 if strings.ContainsAny(nick, illegalNickChars) {
644 return ircError{&irc.Message{
645 Command: irc.ERR_ERRONEUSNICKNAME,
646 Params: []string{dc.nick, nick, "contains illegal characters"},
647 }}
648 }
649 nickCM := casemapASCII(nick)
650 if nickCM == serviceNickCM {
651 return ircError{&irc.Message{
652 Command: irc.ERR_NICKNAMEINUSE,
653 Params: []string{dc.nick, nick, "Nickname reserved for bouncer service"},
654 }}
655 }
656 dc.nick = nick
657 dc.nickCM = nickCM
658 case "USER":
659 if err := parseMessageParams(msg, &dc.rawUsername, nil, nil, &dc.realname); err != nil {
660 return err
661 }
662 case "PASS":
663 if err := parseMessageParams(msg, &dc.password); err != nil {
664 return err
665 }
666 case "CAP":
667 var subCmd string
668 if err := parseMessageParams(msg, &subCmd); err != nil {
669 return err
670 }
671 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
672 return err
673 }
674 case "AUTHENTICATE":
675 if !dc.caps["sasl"] {
676 return ircError{&irc.Message{
677 Command: irc.ERR_SASLFAIL,
678 Params: []string{"*", "AUTHENTICATE requires the \"sasl\" capability to be enabled"},
679 }}
680 }
681 if len(msg.Params) == 0 {
682 return ircError{&irc.Message{
683 Command: irc.ERR_SASLFAIL,
684 Params: []string{"*", "Missing AUTHENTICATE argument"},
685 }}
686 }
687 if dc.nick == "" {
688 return ircError{&irc.Message{
689 Command: irc.ERR_SASLFAIL,
690 Params: []string{"*", "Expected NICK command before AUTHENTICATE"},
691 }}
692 }
693
694 var resp []byte
695 if msg.Params[0] == "*" {
696 dc.saslServer = nil
697 return ircError{&irc.Message{
698 Command: irc.ERR_SASLABORTED,
699 Params: []string{"*", "SASL authentication aborted"},
700 }}
701 } else if dc.saslServer == nil {
702 mech := strings.ToUpper(msg.Params[0])
703 switch mech {
704 case "PLAIN":
705 dc.saslServer = sasl.NewPlainServer(sasl.PlainAuthenticator(func(identity, username, password string) error {
706 // TODO: we can't use the command context here, because it
707 // gets cancelled once the command handler returns. SASL
708 // might take multiple AUTHENTICATE commands to complete.
709 return dc.authenticate(context.TODO(), username, password)
710 }))
711 default:
712 return ircError{&irc.Message{
713 Command: irc.ERR_SASLFAIL,
714 Params: []string{"*", fmt.Sprintf("Unsupported SASL mechanism %q", mech)},
715 }}
716 }
717 } else if msg.Params[0] == "+" {
718 resp = nil
719 } else {
720 // TODO: multi-line messages
721 var err error
722 resp, err = base64.StdEncoding.DecodeString(msg.Params[0])
723 if err != nil {
724 dc.saslServer = nil
725 return ircError{&irc.Message{
726 Command: irc.ERR_SASLFAIL,
727 Params: []string{"*", "Invalid base64-encoded response"},
728 }}
729 }
730 }
731
732 challenge, done, err := dc.saslServer.Next(resp)
733 if err != nil {
734 dc.saslServer = nil
735 if ircErr, ok := err.(ircError); ok && ircErr.Message.Command == irc.ERR_PASSWDMISMATCH {
736 return ircError{&irc.Message{
737 Command: irc.ERR_SASLFAIL,
738 Params: []string{"*", ircErr.Message.Params[1]},
739 }}
740 }
741 dc.SendMessage(&irc.Message{
742 Prefix: dc.srv.prefix(),
743 Command: irc.ERR_SASLFAIL,
744 Params: []string{"*", "SASL error"},
745 })
746 return fmt.Errorf("SASL authentication failed: %v", err)
747 } else if done {
748 dc.saslServer = nil
749 dc.SendMessage(&irc.Message{
750 Prefix: dc.srv.prefix(),
751 Command: irc.RPL_LOGGEDIN,
752 Params: []string{dc.nick, dc.prefix().String(), dc.user.Username, "You are now logged in"},
753 })
754 dc.SendMessage(&irc.Message{
755 Prefix: dc.srv.prefix(),
756 Command: irc.RPL_SASLSUCCESS,
757 Params: []string{dc.nick, "SASL authentication successful"},
758 })
759 } else {
760 challengeStr := "+"
761 if len(challenge) > 0 {
762 challengeStr = base64.StdEncoding.EncodeToString(challenge)
763 }
764
765 // TODO: multi-line messages
766 dc.SendMessage(&irc.Message{
767 Prefix: dc.srv.prefix(),
768 Command: "AUTHENTICATE",
769 Params: []string{challengeStr},
770 })
771 }
772 case "BOUNCER":
773 var subcommand string
774 if err := parseMessageParams(msg, &subcommand); err != nil {
775 return err
776 }
777
778 switch strings.ToUpper(subcommand) {
779 case "BIND":
780 var idStr string
781 if err := parseMessageParams(msg, nil, &idStr); err != nil {
782 return err
783 }
784
785 if dc.user == nil {
786 return ircError{&irc.Message{
787 Command: "FAIL",
788 Params: []string{"BOUNCER", "ACCOUNT_REQUIRED", "BIND", "Authentication needed to bind to bouncer network"},
789 }}
790 }
791
792 id, err := parseBouncerNetID(subcommand, idStr)
793 if err != nil {
794 return err
795 }
796
797 var match *network
798 dc.user.forEachNetwork(func(net *network) {
799 if net.ID == id {
800 match = net
801 }
802 })
803 if match == nil {
804 return ircError{&irc.Message{
805 Command: "FAIL",
806 Params: []string{"BOUNCER", "INVALID_NETID", idStr, "Unknown network ID"},
807 }}
808 }
809
810 dc.networkName = match.GetName()
811 }
812 default:
813 dc.logger.Printf("unhandled message: %v", msg)
814 return newUnknownCommandError(msg.Command)
815 }
816 if dc.rawUsername != "" && dc.nick != "" && !dc.negotiatingCaps {
817 return dc.register(ctx)
818 }
819 return nil
820}
821
822func (dc *downstreamConn) handleCapCommand(cmd string, args []string) error {
823 cmd = strings.ToUpper(cmd)
824
825 replyTo := dc.nick
826 if !dc.registered {
827 replyTo = "*"
828 }
829
830 switch cmd {
831 case "LS":
832 if len(args) > 0 {
833 var err error
834 if dc.capVersion, err = strconv.Atoi(args[0]); err != nil {
835 return err
836 }
837 }
838 if !dc.registered && dc.capVersion >= 302 {
839 // Let downstream show everything it supports, and trim
840 // down the available capabilities when upstreams are
841 // known.
842 for k, v := range needAllDownstreamCaps {
843 dc.supportedCaps[k] = v
844 }
845 }
846
847 caps := make([]string, 0, len(dc.supportedCaps))
848 for k, v := range dc.supportedCaps {
849 if dc.capVersion >= 302 && v != "" {
850 caps = append(caps, k+"="+v)
851 } else {
852 caps = append(caps, k)
853 }
854 }
855
856 // TODO: multi-line replies
857 dc.SendMessage(&irc.Message{
858 Prefix: dc.srv.prefix(),
859 Command: "CAP",
860 Params: []string{replyTo, "LS", strings.Join(caps, " ")},
861 })
862
863 if dc.capVersion >= 302 {
864 // CAP version 302 implicitly enables cap-notify
865 dc.caps["cap-notify"] = true
866 }
867
868 if !dc.registered {
869 dc.negotiatingCaps = true
870 }
871 case "LIST":
872 var caps []string
873 for name, enabled := range dc.caps {
874 if enabled {
875 caps = append(caps, name)
876 }
877 }
878
879 // TODO: multi-line replies
880 dc.SendMessage(&irc.Message{
881 Prefix: dc.srv.prefix(),
882 Command: "CAP",
883 Params: []string{replyTo, "LIST", strings.Join(caps, " ")},
884 })
885 case "REQ":
886 if len(args) == 0 {
887 return ircError{&irc.Message{
888 Command: err_invalidcapcmd,
889 Params: []string{replyTo, cmd, "Missing argument in CAP REQ command"},
890 }}
891 }
892
893 // TODO: atomically ack/nak the whole capability set
894 caps := strings.Fields(args[0])
895 ack := true
896 for _, name := range caps {
897 name = strings.ToLower(name)
898 enable := !strings.HasPrefix(name, "-")
899 if !enable {
900 name = strings.TrimPrefix(name, "-")
901 }
902
903 if enable == dc.caps[name] {
904 continue
905 }
906
907 _, ok := dc.supportedCaps[name]
908 if !ok {
909 ack = false
910 break
911 }
912
913 if name == "cap-notify" && dc.capVersion >= 302 && !enable {
914 // cap-notify cannot be disabled with CAP version 302
915 ack = false
916 break
917 }
918
919 dc.caps[name] = enable
920 }
921
922 reply := "NAK"
923 if ack {
924 reply = "ACK"
925 }
926 dc.SendMessage(&irc.Message{
927 Prefix: dc.srv.prefix(),
928 Command: "CAP",
929 Params: []string{replyTo, reply, args[0]},
930 })
931
932 if !dc.registered {
933 dc.negotiatingCaps = true
934 }
935 case "END":
936 dc.negotiatingCaps = false
937 default:
938 return ircError{&irc.Message{
939 Command: err_invalidcapcmd,
940 Params: []string{replyTo, cmd, "Unknown CAP command"},
941 }}
942 }
943 return nil
944}
945
946func (dc *downstreamConn) setSupportedCap(name, value string) {
947 prevValue, hasPrev := dc.supportedCaps[name]
948 changed := !hasPrev || prevValue != value
949 dc.supportedCaps[name] = value
950
951 if !dc.caps["cap-notify"] || !changed {
952 return
953 }
954
955 replyTo := dc.nick
956 if !dc.registered {
957 replyTo = "*"
958 }
959
960 cap := name
961 if value != "" && dc.capVersion >= 302 {
962 cap = name + "=" + value
963 }
964
965 dc.SendMessage(&irc.Message{
966 Prefix: dc.srv.prefix(),
967 Command: "CAP",
968 Params: []string{replyTo, "NEW", cap},
969 })
970}
971
972func (dc *downstreamConn) unsetSupportedCap(name string) {
973 _, hasPrev := dc.supportedCaps[name]
974 delete(dc.supportedCaps, name)
975 delete(dc.caps, name)
976
977 if !dc.caps["cap-notify"] || !hasPrev {
978 return
979 }
980
981 replyTo := dc.nick
982 if !dc.registered {
983 replyTo = "*"
984 }
985
986 dc.SendMessage(&irc.Message{
987 Prefix: dc.srv.prefix(),
988 Command: "CAP",
989 Params: []string{replyTo, "DEL", name},
990 })
991}
992
993func (dc *downstreamConn) updateSupportedCaps() {
994 supportedCaps := make(map[string]bool)
995 for cap := range needAllDownstreamCaps {
996 supportedCaps[cap] = true
997 }
998 dc.forEachUpstream(func(uc *upstreamConn) {
999 for cap, supported := range supportedCaps {
1000 supportedCaps[cap] = supported && uc.caps[cap]
1001 }
1002 })
1003
1004 for cap, supported := range supportedCaps {
1005 if supported {
1006 dc.setSupportedCap(cap, needAllDownstreamCaps[cap])
1007 } else {
1008 dc.unsetSupportedCap(cap)
1009 }
1010 }
1011
1012 if _, ok := dc.user.msgStore.(chatHistoryMessageStore); ok && dc.network != nil {
1013 dc.setSupportedCap("draft/event-playback", "")
1014 } else {
1015 dc.unsetSupportedCap("draft/event-playback")
1016 }
1017}
1018
1019func (dc *downstreamConn) updateNick() {
1020 if uc := dc.upstream(); uc != nil && uc.nick != dc.nick {
1021 dc.SendMessage(&irc.Message{
1022 Prefix: dc.prefix(),
1023 Command: "NICK",
1024 Params: []string{uc.nick},
1025 })
1026 dc.nick = uc.nick
1027 dc.nickCM = casemapASCII(dc.nick)
1028 }
1029}
1030
1031func (dc *downstreamConn) updateRealname() {
1032 if uc := dc.upstream(); uc != nil && uc.realname != dc.realname && dc.caps["setname"] {
1033 dc.SendMessage(&irc.Message{
1034 Prefix: dc.prefix(),
1035 Command: "SETNAME",
1036 Params: []string{uc.realname},
1037 })
1038 dc.realname = uc.realname
1039 }
1040}
1041
1042func sanityCheckServer(ctx context.Context, addr string) error {
1043 ctx, cancel := context.WithTimeout(ctx, 15*time.Second)
1044 defer cancel()
1045
1046 conn, err := new(tls.Dialer).DialContext(ctx, "tcp", addr)
1047 if err != nil {
1048 return err
1049 }
1050
1051 return conn.Close()
1052}
1053
1054func unmarshalUsername(rawUsername string) (username, client, network string) {
1055 username = rawUsername
1056
1057 i := strings.IndexAny(username, "/@")
1058 j := strings.LastIndexAny(username, "/@")
1059 if i >= 0 {
1060 username = rawUsername[:i]
1061 }
1062 if j >= 0 {
1063 if rawUsername[j] == '@' {
1064 client = rawUsername[j+1:]
1065 } else {
1066 network = rawUsername[j+1:]
1067 }
1068 }
1069 if i >= 0 && j >= 0 && i < j {
1070 if rawUsername[i] == '@' {
1071 client = rawUsername[i+1 : j]
1072 } else {
1073 network = rawUsername[i+1 : j]
1074 }
1075 }
1076
1077 return username, client, network
1078}
1079
1080func (dc *downstreamConn) authenticate(ctx context.Context, username, password string) error {
1081 username, clientName, networkName := unmarshalUsername(username)
1082
1083 u, err := dc.srv.db.GetUser(ctx, username)
1084 if err != nil {
1085 dc.logger.Printf("failed authentication for %q: user not found: %v", username, err)
1086 return errAuthFailed
1087 }
1088
1089 // Password auth disabled
1090 if u.Password == "" {
1091 return errAuthFailed
1092 }
1093
1094 err = bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(password))
1095 if err != nil {
1096 dc.logger.Printf("failed authentication for %q: wrong password: %v", username, err)
1097 return errAuthFailed
1098 }
1099
1100 dc.user = dc.srv.getUser(username)
1101 if dc.user == nil {
1102 dc.logger.Printf("failed authentication for %q: user not active", username)
1103 return errAuthFailed
1104 }
1105 dc.clientName = clientName
1106 dc.networkName = networkName
1107 return nil
1108}
1109
1110func (dc *downstreamConn) register(ctx context.Context) error {
1111 if dc.registered {
1112 return fmt.Errorf("tried to register twice")
1113 }
1114
1115 password := dc.password
1116 dc.password = ""
1117 if dc.user == nil {
1118 if err := dc.authenticate(ctx, dc.rawUsername, password); err != nil {
1119 return err
1120 }
1121 }
1122
1123 if dc.clientName == "" && dc.networkName == "" {
1124 _, dc.clientName, dc.networkName = unmarshalUsername(dc.rawUsername)
1125 }
1126
1127 dc.registered = true
1128 dc.logger.Printf("registration complete for user %q", dc.user.Username)
1129 return nil
1130}
1131
1132func (dc *downstreamConn) loadNetwork(ctx context.Context) error {
1133 if dc.networkName == "" {
1134 return nil
1135 }
1136
1137 network := dc.user.getNetwork(dc.networkName)
1138 if network == nil {
1139 addr := dc.networkName
1140 if !strings.ContainsRune(addr, ':') {
1141 addr = addr + ":6697"
1142 }
1143
1144 dc.logger.Printf("trying to connect to new network %q", addr)
1145 if err := sanityCheckServer(ctx, addr); err != nil {
1146 dc.logger.Printf("failed to connect to %q: %v", addr, err)
1147 return ircError{&irc.Message{
1148 Command: irc.ERR_PASSWDMISMATCH,
1149 Params: []string{"*", fmt.Sprintf("Failed to connect to %q", dc.networkName)},
1150 }}
1151 }
1152
1153 // Some clients only allow specifying the nickname (and use the
1154 // nickname as a username too). Strip the network name from the
1155 // nickname when auto-saving networks.
1156 nick, _, _ := unmarshalUsername(dc.nick)
1157
1158 dc.logger.Printf("auto-saving network %q", dc.networkName)
1159 var err error
1160 network, err = dc.user.createNetwork(ctx, &Network{
1161 Addr: dc.networkName,
1162 Nick: nick,
1163 Enabled: true,
1164 })
1165 if err != nil {
1166 return err
1167 }
1168 }
1169
1170 dc.network = network
1171 return nil
1172}
1173
1174func (dc *downstreamConn) welcome(ctx context.Context) error {
1175 if dc.user == nil || !dc.registered {
1176 panic("tried to welcome an unregistered connection")
1177 }
1178
1179 // TODO: doing this might take some time. We should do it in dc.register
1180 // instead, but we'll potentially be adding a new network and this must be
1181 // done in the user goroutine.
1182 if err := dc.loadNetwork(ctx); err != nil {
1183 return err
1184 }
1185
1186 if dc.network == nil && !dc.caps["soju.im/bouncer-networks"] && dc.srv.Config().MultiUpstream {
1187 dc.isMultiUpstream = true
1188 }
1189
1190 isupport := []string{
1191 fmt.Sprintf("CHATHISTORY=%v", chatHistoryLimit),
1192 "CASEMAPPING=ascii",
1193 }
1194
1195 if dc.network != nil {
1196 isupport = append(isupport, fmt.Sprintf("BOUNCER_NETID=%v", dc.network.ID))
1197 }
1198 if title := dc.srv.Config().Title; dc.network == nil && title != "" {
1199 isupport = append(isupport, "NETWORK="+encodeISUPPORT(title))
1200 }
1201 if dc.network == nil && !dc.isMultiUpstream {
1202 isupport = append(isupport, "WHOX")
1203 }
1204
1205 if uc := dc.upstream(); uc != nil {
1206 for k := range passthroughIsupport {
1207 v, ok := uc.isupport[k]
1208 if !ok {
1209 continue
1210 }
1211 if v != nil {
1212 isupport = append(isupport, fmt.Sprintf("%v=%v", k, *v))
1213 } else {
1214 isupport = append(isupport, k)
1215 }
1216 }
1217 }
1218
1219 dc.SendMessage(&irc.Message{
1220 Prefix: dc.srv.prefix(),
1221 Command: irc.RPL_WELCOME,
1222 Params: []string{dc.nick, "Welcome to soju, " + dc.nick},
1223 })
1224 dc.SendMessage(&irc.Message{
1225 Prefix: dc.srv.prefix(),
1226 Command: irc.RPL_YOURHOST,
1227 Params: []string{dc.nick, "Your host is " + dc.srv.Config().Hostname},
1228 })
1229 dc.SendMessage(&irc.Message{
1230 Prefix: dc.srv.prefix(),
1231 Command: irc.RPL_MYINFO,
1232 Params: []string{dc.nick, dc.srv.Config().Hostname, "soju", "aiwroO", "OovaimnqpsrtklbeI"},
1233 })
1234 for _, msg := range generateIsupport(dc.srv.prefix(), dc.nick, isupport) {
1235 dc.SendMessage(msg)
1236 }
1237 if uc := dc.upstream(); uc != nil {
1238 dc.SendMessage(&irc.Message{
1239 Prefix: dc.srv.prefix(),
1240 Command: irc.RPL_UMODEIS,
1241 Params: []string{dc.nick, "+" + string(uc.modes)},
1242 })
1243 }
1244 if dc.network == nil && !dc.isMultiUpstream && dc.user.Admin {
1245 dc.SendMessage(&irc.Message{
1246 Prefix: dc.srv.prefix(),
1247 Command: irc.RPL_UMODEIS,
1248 Params: []string{dc.nick, "+o"},
1249 })
1250 }
1251
1252 if motd := dc.user.srv.Config().MOTD; motd != "" && dc.network == nil {
1253 for _, msg := range generateMOTD(dc.srv.prefix(), dc.nick, motd) {
1254 dc.SendMessage(msg)
1255 }
1256 } else {
1257 motdHint := "No MOTD"
1258 if dc.network != nil {
1259 motdHint = "Use /motd to read the message of the day"
1260 }
1261 dc.SendMessage(&irc.Message{
1262 Prefix: dc.srv.prefix(),
1263 Command: irc.ERR_NOMOTD,
1264 Params: []string{dc.nick, motdHint},
1265 })
1266 }
1267
1268 dc.updateNick()
1269 dc.updateRealname()
1270 dc.updateSupportedCaps()
1271
1272 if dc.caps["soju.im/bouncer-networks-notify"] {
1273 dc.SendBatch("soju.im/bouncer-networks", nil, nil, func(batchRef irc.TagValue) {
1274 dc.user.forEachNetwork(func(network *network) {
1275 idStr := fmt.Sprintf("%v", network.ID)
1276 attrs := getNetworkAttrs(network)
1277 dc.SendMessage(&irc.Message{
1278 Tags: irc.Tags{"batch": batchRef},
1279 Prefix: dc.srv.prefix(),
1280 Command: "BOUNCER",
1281 Params: []string{"NETWORK", idStr, attrs.String()},
1282 })
1283 })
1284 })
1285 }
1286
1287 dc.forEachUpstream(func(uc *upstreamConn) {
1288 for _, entry := range uc.channels.innerMap {
1289 ch := entry.value.(*upstreamChannel)
1290 if !ch.complete {
1291 continue
1292 }
1293 record := uc.network.channels.Value(ch.Name)
1294 if record != nil && record.Detached {
1295 continue
1296 }
1297
1298 dc.SendMessage(&irc.Message{
1299 Prefix: dc.prefix(),
1300 Command: "JOIN",
1301 Params: []string{dc.marshalEntity(ch.conn.network, ch.Name)},
1302 })
1303
1304 forwardChannel(dc, ch)
1305 }
1306 })
1307
1308 dc.forEachNetwork(func(net *network) {
1309 if dc.caps["draft/chathistory"] || dc.user.msgStore == nil {
1310 return
1311 }
1312
1313 // Only send history if we're the first connected client with that name
1314 // for the network
1315 firstClient := true
1316 dc.user.forEachDownstream(func(c *downstreamConn) {
1317 if c != dc && c.clientName == dc.clientName && c.network == dc.network {
1318 firstClient = false
1319 }
1320 })
1321 if firstClient {
1322 net.delivered.ForEachTarget(func(target string) {
1323 lastDelivered := net.delivered.LoadID(target, dc.clientName)
1324 if lastDelivered == "" {
1325 return
1326 }
1327
1328 dc.sendTargetBacklog(ctx, net, target, lastDelivered)
1329
1330 // Fast-forward history to last message
1331 targetCM := net.casemap(target)
1332 lastID, err := dc.user.msgStore.LastMsgID(&net.Network, targetCM, time.Now())
1333 if err != nil {
1334 dc.logger.Printf("failed to get last message ID: %v", err)
1335 return
1336 }
1337 net.delivered.StoreID(target, dc.clientName, lastID)
1338 })
1339 }
1340 })
1341
1342 return nil
1343}
1344
1345// messageSupportsBacklog checks whether the provided message can be sent as
1346// part of an history batch.
1347func (dc *downstreamConn) messageSupportsBacklog(msg *irc.Message) bool {
1348 // Don't replay all messages, because that would mess up client
1349 // state. For instance we just sent the list of users, sending
1350 // PART messages for one of these users would be incorrect.
1351 switch msg.Command {
1352 case "PRIVMSG", "NOTICE":
1353 return true
1354 }
1355 return false
1356}
1357
1358func (dc *downstreamConn) sendTargetBacklog(ctx context.Context, net *network, target, msgID string) {
1359 if dc.caps["draft/chathistory"] || dc.user.msgStore == nil {
1360 return
1361 }
1362
1363 ch := net.channels.Value(target)
1364
1365 ctx, cancel := context.WithTimeout(ctx, backlogTimeout)
1366 defer cancel()
1367
1368 targetCM := net.casemap(target)
1369 history, err := dc.user.msgStore.LoadLatestID(ctx, &net.Network, targetCM, msgID, backlogLimit)
1370 if err != nil {
1371 dc.logger.Printf("failed to send backlog for %q: %v", target, err)
1372 return
1373 }
1374
1375 dc.SendBatch("chathistory", []string{dc.marshalEntity(net, target)}, nil, func(batchRef irc.TagValue) {
1376 for _, msg := range history {
1377 if ch != nil && ch.Detached {
1378 if net.detachedMessageNeedsRelay(ch, msg) {
1379 dc.relayDetachedMessage(net, msg)
1380 }
1381 } else {
1382 msg.Tags["batch"] = batchRef
1383 dc.SendMessage(dc.marshalMessage(msg, net))
1384 }
1385 }
1386 })
1387}
1388
1389func (dc *downstreamConn) relayDetachedMessage(net *network, msg *irc.Message) {
1390 if msg.Command != "PRIVMSG" && msg.Command != "NOTICE" {
1391 return
1392 }
1393
1394 sender := msg.Prefix.Name
1395 target, text := msg.Params[0], msg.Params[1]
1396 if net.isHighlight(msg) {
1397 sendServiceNOTICE(dc, fmt.Sprintf("highlight in %v: <%v> %v", dc.marshalEntity(net, target), sender, text))
1398 } else {
1399 sendServiceNOTICE(dc, fmt.Sprintf("message in %v: <%v> %v", dc.marshalEntity(net, target), sender, text))
1400 }
1401}
1402
1403func (dc *downstreamConn) runUntilRegistered() error {
1404 ctx, cancel := context.WithTimeout(context.TODO(), downstreamRegisterTimeout)
1405 defer cancel()
1406
1407 // Close the connection with an error if the deadline is exceeded
1408 go func() {
1409 <-ctx.Done()
1410 if err := ctx.Err(); err == context.DeadlineExceeded {
1411 dc.SendMessage(&irc.Message{
1412 Prefix: dc.srv.prefix(),
1413 Command: "ERROR",
1414 Params: []string{"Connection registration timed out"},
1415 })
1416 dc.Close()
1417 }
1418 }()
1419
1420 for !dc.registered {
1421 msg, err := dc.ReadMessage()
1422 if err != nil {
1423 return fmt.Errorf("failed to read IRC command: %w", err)
1424 }
1425
1426 err = dc.handleMessage(ctx, msg)
1427 if ircErr, ok := err.(ircError); ok {
1428 ircErr.Message.Prefix = dc.srv.prefix()
1429 dc.SendMessage(ircErr.Message)
1430 } else if err != nil {
1431 return fmt.Errorf("failed to handle IRC command %q: %v", msg, err)
1432 }
1433 }
1434
1435 return nil
1436}
1437
1438func (dc *downstreamConn) handleMessageRegistered(ctx context.Context, msg *irc.Message) error {
1439 switch msg.Command {
1440 case "CAP":
1441 var subCmd string
1442 if err := parseMessageParams(msg, &subCmd); err != nil {
1443 return err
1444 }
1445 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
1446 return err
1447 }
1448 case "PING":
1449 var source, destination string
1450 if err := parseMessageParams(msg, &source); err != nil {
1451 return err
1452 }
1453 if len(msg.Params) > 1 {
1454 destination = msg.Params[1]
1455 }
1456 hostname := dc.srv.Config().Hostname
1457 if destination != "" && destination != hostname {
1458 return ircError{&irc.Message{
1459 Command: irc.ERR_NOSUCHSERVER,
1460 Params: []string{dc.nick, destination, "No such server"},
1461 }}
1462 }
1463 dc.SendMessage(&irc.Message{
1464 Prefix: dc.srv.prefix(),
1465 Command: "PONG",
1466 Params: []string{hostname, source},
1467 })
1468 return nil
1469 case "PONG":
1470 if len(msg.Params) == 0 {
1471 return newNeedMoreParamsError(msg.Command)
1472 }
1473 token := msg.Params[len(msg.Params)-1]
1474 dc.handlePong(token)
1475 case "USER":
1476 return ircError{&irc.Message{
1477 Command: irc.ERR_ALREADYREGISTERED,
1478 Params: []string{dc.nick, "You may not reregister"},
1479 }}
1480 case "NICK":
1481 var rawNick string
1482 if err := parseMessageParams(msg, &rawNick); err != nil {
1483 return err
1484 }
1485
1486 nick := rawNick
1487 var upstream *upstreamConn
1488 if dc.upstream() == nil {
1489 uc, unmarshaledNick, err := dc.unmarshalEntity(nick)
1490 if err == nil { // NICK nick/network: NICK only on a specific upstream
1491 upstream = uc
1492 nick = unmarshaledNick
1493 }
1494 }
1495
1496 if strings.ContainsAny(nick, illegalNickChars) {
1497 return ircError{&irc.Message{
1498 Command: irc.ERR_ERRONEUSNICKNAME,
1499 Params: []string{dc.nick, rawNick, "contains illegal characters"},
1500 }}
1501 }
1502 if casemapASCII(nick) == serviceNickCM {
1503 return ircError{&irc.Message{
1504 Command: irc.ERR_NICKNAMEINUSE,
1505 Params: []string{dc.nick, rawNick, "Nickname reserved for bouncer service"},
1506 }}
1507 }
1508
1509 var err error
1510 dc.forEachNetwork(func(n *network) {
1511 if err != nil || (upstream != nil && upstream.network != n) {
1512 return
1513 }
1514 n.Nick = nick
1515 err = dc.srv.db.StoreNetwork(ctx, dc.user.ID, &n.Network)
1516 })
1517 if err != nil {
1518 return err
1519 }
1520
1521 dc.forEachUpstream(func(uc *upstreamConn) {
1522 if upstream != nil && upstream != uc {
1523 return
1524 }
1525 uc.SendMessageLabeled(dc.id, &irc.Message{
1526 Command: "NICK",
1527 Params: []string{nick},
1528 })
1529 })
1530
1531 if dc.upstream() == nil && upstream == nil && dc.nick != nick {
1532 dc.SendMessage(&irc.Message{
1533 Prefix: dc.prefix(),
1534 Command: "NICK",
1535 Params: []string{nick},
1536 })
1537 dc.nick = nick
1538 dc.nickCM = casemapASCII(dc.nick)
1539 }
1540 case "SETNAME":
1541 var realname string
1542 if err := parseMessageParams(msg, &realname); err != nil {
1543 return err
1544 }
1545
1546 // If the client just resets to the default, just wipe the per-network
1547 // preference
1548 storeRealname := realname
1549 if realname == dc.user.Realname {
1550 storeRealname = ""
1551 }
1552
1553 var storeErr error
1554 var needUpdate []Network
1555 dc.forEachNetwork(func(n *network) {
1556 // We only need to call updateNetwork for upstreams that don't
1557 // support setname
1558 if uc := n.conn; uc != nil && uc.caps["setname"] {
1559 uc.SendMessageLabeled(dc.id, &irc.Message{
1560 Command: "SETNAME",
1561 Params: []string{realname},
1562 })
1563
1564 n.Realname = storeRealname
1565 if err := dc.srv.db.StoreNetwork(ctx, dc.user.ID, &n.Network); err != nil {
1566 dc.logger.Printf("failed to store network realname: %v", err)
1567 storeErr = err
1568 }
1569 return
1570 }
1571
1572 record := n.Network // copy network record because we'll mutate it
1573 record.Realname = storeRealname
1574 needUpdate = append(needUpdate, record)
1575 })
1576
1577 // Walk the network list as a second step, because updateNetwork
1578 // mutates the original list
1579 for _, record := range needUpdate {
1580 if _, err := dc.user.updateNetwork(ctx, &record); err != nil {
1581 dc.logger.Printf("failed to update network realname: %v", err)
1582 storeErr = err
1583 }
1584 }
1585 if storeErr != nil {
1586 return ircError{&irc.Message{
1587 Command: "FAIL",
1588 Params: []string{"SETNAME", "CANNOT_CHANGE_REALNAME", "Failed to update realname"},
1589 }}
1590 }
1591
1592 if dc.upstream() == nil {
1593 dc.SendMessage(&irc.Message{
1594 Prefix: dc.prefix(),
1595 Command: "SETNAME",
1596 Params: []string{realname},
1597 })
1598 }
1599 case "JOIN":
1600 var namesStr string
1601 if err := parseMessageParams(msg, &namesStr); err != nil {
1602 return err
1603 }
1604
1605 var keys []string
1606 if len(msg.Params) > 1 {
1607 keys = strings.Split(msg.Params[1], ",")
1608 }
1609
1610 for i, name := range strings.Split(namesStr, ",") {
1611 uc, upstreamName, err := dc.unmarshalEntity(name)
1612 if err != nil {
1613 return err
1614 }
1615
1616 var key string
1617 if len(keys) > i {
1618 key = keys[i]
1619 }
1620
1621 if !uc.isChannel(upstreamName) {
1622 dc.SendMessage(&irc.Message{
1623 Prefix: dc.srv.prefix(),
1624 Command: irc.ERR_NOSUCHCHANNEL,
1625 Params: []string{name, "Not a channel name"},
1626 })
1627 continue
1628 }
1629
1630 params := []string{upstreamName}
1631 if key != "" {
1632 params = append(params, key)
1633 }
1634 uc.SendMessageLabeled(dc.id, &irc.Message{
1635 Command: "JOIN",
1636 Params: params,
1637 })
1638
1639 ch := uc.network.channels.Value(upstreamName)
1640 if ch != nil {
1641 // Don't clear the channel key if there's one set
1642 // TODO: add a way to unset the channel key
1643 if key != "" {
1644 ch.Key = key
1645 }
1646 uc.network.attach(ch)
1647 } else {
1648 ch = &Channel{
1649 Name: upstreamName,
1650 Key: key,
1651 }
1652 uc.network.channels.SetValue(upstreamName, ch)
1653 }
1654 if err := dc.srv.db.StoreChannel(ctx, uc.network.ID, ch); err != nil {
1655 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1656 }
1657 }
1658 case "PART":
1659 var namesStr string
1660 if err := parseMessageParams(msg, &namesStr); err != nil {
1661 return err
1662 }
1663
1664 var reason string
1665 if len(msg.Params) > 1 {
1666 reason = msg.Params[1]
1667 }
1668
1669 for _, name := range strings.Split(namesStr, ",") {
1670 uc, upstreamName, err := dc.unmarshalEntity(name)
1671 if err != nil {
1672 return err
1673 }
1674
1675 if strings.EqualFold(reason, "detach") {
1676 ch := uc.network.channels.Value(upstreamName)
1677 if ch != nil {
1678 uc.network.detach(ch)
1679 } else {
1680 ch = &Channel{
1681 Name: name,
1682 Detached: true,
1683 }
1684 uc.network.channels.SetValue(upstreamName, ch)
1685 }
1686 if err := dc.srv.db.StoreChannel(ctx, uc.network.ID, ch); err != nil {
1687 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1688 }
1689 } else {
1690 params := []string{upstreamName}
1691 if reason != "" {
1692 params = append(params, reason)
1693 }
1694 uc.SendMessageLabeled(dc.id, &irc.Message{
1695 Command: "PART",
1696 Params: params,
1697 })
1698
1699 if err := uc.network.deleteChannel(ctx, upstreamName); err != nil {
1700 dc.logger.Printf("failed to delete channel %q: %v", upstreamName, err)
1701 }
1702 }
1703 }
1704 case "KICK":
1705 var channelStr, userStr string
1706 if err := parseMessageParams(msg, &channelStr, &userStr); err != nil {
1707 return err
1708 }
1709
1710 channels := strings.Split(channelStr, ",")
1711 users := strings.Split(userStr, ",")
1712
1713 var reason string
1714 if len(msg.Params) > 2 {
1715 reason = msg.Params[2]
1716 }
1717
1718 if len(channels) != 1 && len(channels) != len(users) {
1719 return ircError{&irc.Message{
1720 Command: irc.ERR_BADCHANMASK,
1721 Params: []string{dc.nick, channelStr, "Bad channel mask"},
1722 }}
1723 }
1724
1725 for i, user := range users {
1726 var channel string
1727 if len(channels) == 1 {
1728 channel = channels[0]
1729 } else {
1730 channel = channels[i]
1731 }
1732
1733 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1734 if err != nil {
1735 return err
1736 }
1737
1738 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1739 if err != nil {
1740 return err
1741 }
1742
1743 if ucChannel != ucUser {
1744 return ircError{&irc.Message{
1745 Command: irc.ERR_USERNOTINCHANNEL,
1746 Params: []string{dc.nick, user, channel, "They are on another network"},
1747 }}
1748 }
1749 uc := ucChannel
1750
1751 params := []string{upstreamChannel, upstreamUser}
1752 if reason != "" {
1753 params = append(params, reason)
1754 }
1755 uc.SendMessageLabeled(dc.id, &irc.Message{
1756 Command: "KICK",
1757 Params: params,
1758 })
1759 }
1760 case "MODE":
1761 var name string
1762 if err := parseMessageParams(msg, &name); err != nil {
1763 return err
1764 }
1765
1766 var modeStr string
1767 if len(msg.Params) > 1 {
1768 modeStr = msg.Params[1]
1769 }
1770
1771 if casemapASCII(name) == dc.nickCM {
1772 if modeStr != "" {
1773 if uc := dc.upstream(); uc != nil {
1774 uc.SendMessageLabeled(dc.id, &irc.Message{
1775 Command: "MODE",
1776 Params: []string{uc.nick, modeStr},
1777 })
1778 } else {
1779 dc.SendMessage(&irc.Message{
1780 Prefix: dc.srv.prefix(),
1781 Command: irc.ERR_UMODEUNKNOWNFLAG,
1782 Params: []string{dc.nick, "Cannot change user mode in multi-upstream mode"},
1783 })
1784 }
1785 } else {
1786 var userMode string
1787 if uc := dc.upstream(); uc != nil {
1788 userMode = string(uc.modes)
1789 }
1790
1791 dc.SendMessage(&irc.Message{
1792 Prefix: dc.srv.prefix(),
1793 Command: irc.RPL_UMODEIS,
1794 Params: []string{dc.nick, "+" + userMode},
1795 })
1796 }
1797 return nil
1798 }
1799
1800 uc, upstreamName, err := dc.unmarshalEntity(name)
1801 if err != nil {
1802 return err
1803 }
1804
1805 if !uc.isChannel(upstreamName) {
1806 return ircError{&irc.Message{
1807 Command: irc.ERR_USERSDONTMATCH,
1808 Params: []string{dc.nick, "Cannot change mode for other users"},
1809 }}
1810 }
1811
1812 if modeStr != "" {
1813 params := []string{upstreamName, modeStr}
1814 params = append(params, msg.Params[2:]...)
1815 uc.SendMessageLabeled(dc.id, &irc.Message{
1816 Command: "MODE",
1817 Params: params,
1818 })
1819 } else {
1820 ch := uc.channels.Value(upstreamName)
1821 if ch == nil {
1822 return ircError{&irc.Message{
1823 Command: irc.ERR_NOSUCHCHANNEL,
1824 Params: []string{dc.nick, name, "No such channel"},
1825 }}
1826 }
1827
1828 if ch.modes == nil {
1829 // we haven't received the initial RPL_CHANNELMODEIS yet
1830 // ignore the request, we will broadcast the modes later when we receive RPL_CHANNELMODEIS
1831 return nil
1832 }
1833
1834 modeStr, modeParams := ch.modes.Format()
1835 params := []string{dc.nick, name, modeStr}
1836 params = append(params, modeParams...)
1837
1838 dc.SendMessage(&irc.Message{
1839 Prefix: dc.srv.prefix(),
1840 Command: irc.RPL_CHANNELMODEIS,
1841 Params: params,
1842 })
1843 if ch.creationTime != "" {
1844 dc.SendMessage(&irc.Message{
1845 Prefix: dc.srv.prefix(),
1846 Command: rpl_creationtime,
1847 Params: []string{dc.nick, name, ch.creationTime},
1848 })
1849 }
1850 }
1851 case "TOPIC":
1852 var channel string
1853 if err := parseMessageParams(msg, &channel); err != nil {
1854 return err
1855 }
1856
1857 uc, upstreamName, err := dc.unmarshalEntity(channel)
1858 if err != nil {
1859 return err
1860 }
1861
1862 if len(msg.Params) > 1 { // setting topic
1863 topic := msg.Params[1]
1864 uc.SendMessageLabeled(dc.id, &irc.Message{
1865 Command: "TOPIC",
1866 Params: []string{upstreamName, topic},
1867 })
1868 } else { // getting topic
1869 ch := uc.channels.Value(upstreamName)
1870 if ch == nil {
1871 return ircError{&irc.Message{
1872 Command: irc.ERR_NOSUCHCHANNEL,
1873 Params: []string{dc.nick, upstreamName, "No such channel"},
1874 }}
1875 }
1876 sendTopic(dc, ch)
1877 }
1878 case "LIST":
1879 network := dc.network
1880 if network == nil && len(msg.Params) > 0 {
1881 var err error
1882 network, msg.Params[0], err = dc.unmarshalEntityNetwork(msg.Params[0])
1883 if err != nil {
1884 return err
1885 }
1886 }
1887 if network == nil {
1888 dc.SendMessage(&irc.Message{
1889 Prefix: dc.srv.prefix(),
1890 Command: irc.RPL_LISTEND,
1891 Params: []string{dc.nick, "LIST without a network suffix is not supported in multi-upstream mode"},
1892 })
1893 return nil
1894 }
1895
1896 uc := network.conn
1897 if uc == nil {
1898 dc.SendMessage(&irc.Message{
1899 Prefix: dc.srv.prefix(),
1900 Command: irc.RPL_LISTEND,
1901 Params: []string{dc.nick, "Disconnected from upstream server"},
1902 })
1903 return nil
1904 }
1905
1906 uc.enqueueCommand(dc, msg)
1907 case "NAMES":
1908 if len(msg.Params) == 0 {
1909 dc.SendMessage(&irc.Message{
1910 Prefix: dc.srv.prefix(),
1911 Command: irc.RPL_ENDOFNAMES,
1912 Params: []string{dc.nick, "*", "End of /NAMES list"},
1913 })
1914 return nil
1915 }
1916
1917 channels := strings.Split(msg.Params[0], ",")
1918 for _, channel := range channels {
1919 uc, upstreamName, err := dc.unmarshalEntity(channel)
1920 if err != nil {
1921 return err
1922 }
1923
1924 ch := uc.channels.Value(upstreamName)
1925 if ch != nil {
1926 sendNames(dc, ch)
1927 } else {
1928 // NAMES on a channel we have not joined, ask upstream
1929 uc.SendMessageLabeled(dc.id, &irc.Message{
1930 Command: "NAMES",
1931 Params: []string{upstreamName},
1932 })
1933 }
1934 }
1935 // For WHOX docs, see:
1936 // - http://faerion.sourceforge.net/doc/irc/whox.var
1937 // - https://github.com/quakenet/snircd/blob/master/doc/readme.who
1938 // Note, many features aren't widely implemented, such as flags and mask2
1939 case "WHO":
1940 if len(msg.Params) == 0 {
1941 // TODO: support WHO without parameters
1942 dc.SendMessage(&irc.Message{
1943 Prefix: dc.srv.prefix(),
1944 Command: irc.RPL_ENDOFWHO,
1945 Params: []string{dc.nick, "*", "End of /WHO list"},
1946 })
1947 return nil
1948 }
1949
1950 // Clients will use the first mask to match RPL_ENDOFWHO
1951 endOfWhoToken := msg.Params[0]
1952
1953 // TODO: add support for WHOX mask2
1954 mask := msg.Params[0]
1955 var options string
1956 if len(msg.Params) > 1 {
1957 options = msg.Params[1]
1958 }
1959
1960 optionsParts := strings.SplitN(options, "%", 2)
1961 // TODO: add support for WHOX flags in optionsParts[0]
1962 var fields, whoxToken string
1963 if len(optionsParts) == 2 {
1964 optionsParts := strings.SplitN(optionsParts[1], ",", 2)
1965 fields = strings.ToLower(optionsParts[0])
1966 if len(optionsParts) == 2 && strings.Contains(fields, "t") {
1967 whoxToken = optionsParts[1]
1968 }
1969 }
1970
1971 // TODO: support mixed bouncer/upstream WHO queries
1972 maskCM := casemapASCII(mask)
1973 if dc.network == nil && maskCM == dc.nickCM {
1974 // TODO: support AWAY (H/G) in self WHO reply
1975 flags := "H"
1976 if dc.user.Admin {
1977 flags += "*"
1978 }
1979 info := whoxInfo{
1980 Token: whoxToken,
1981 Username: dc.user.Username,
1982 Hostname: dc.hostname,
1983 Server: dc.srv.Config().Hostname,
1984 Nickname: dc.nick,
1985 Flags: flags,
1986 Account: dc.user.Username,
1987 Realname: dc.realname,
1988 }
1989 dc.SendMessage(generateWHOXReply(dc.srv.prefix(), dc.nick, fields, &info))
1990 dc.SendMessage(&irc.Message{
1991 Prefix: dc.srv.prefix(),
1992 Command: irc.RPL_ENDOFWHO,
1993 Params: []string{dc.nick, endOfWhoToken, "End of /WHO list"},
1994 })
1995 return nil
1996 }
1997 if maskCM == serviceNickCM {
1998 info := whoxInfo{
1999 Token: whoxToken,
2000 Username: servicePrefix.User,
2001 Hostname: servicePrefix.Host,
2002 Server: dc.srv.Config().Hostname,
2003 Nickname: serviceNick,
2004 Flags: "H*",
2005 Account: serviceNick,
2006 Realname: serviceRealname,
2007 }
2008 dc.SendMessage(generateWHOXReply(dc.srv.prefix(), dc.nick, fields, &info))
2009 dc.SendMessage(&irc.Message{
2010 Prefix: dc.srv.prefix(),
2011 Command: irc.RPL_ENDOFWHO,
2012 Params: []string{dc.nick, endOfWhoToken, "End of /WHO list"},
2013 })
2014 return nil
2015 }
2016
2017 // TODO: properly support WHO masks
2018 uc, upstreamMask, err := dc.unmarshalEntity(mask)
2019 if err != nil {
2020 return err
2021 }
2022
2023 params := []string{upstreamMask}
2024 if options != "" {
2025 params = append(params, options)
2026 }
2027
2028 uc.enqueueCommand(dc, &irc.Message{
2029 Command: "WHO",
2030 Params: params,
2031 })
2032 case "WHOIS":
2033 if len(msg.Params) == 0 {
2034 return ircError{&irc.Message{
2035 Command: irc.ERR_NONICKNAMEGIVEN,
2036 Params: []string{dc.nick, "No nickname given"},
2037 }}
2038 }
2039
2040 var target, mask string
2041 if len(msg.Params) == 1 {
2042 target = ""
2043 mask = msg.Params[0]
2044 } else {
2045 target = msg.Params[0]
2046 mask = msg.Params[1]
2047 }
2048 // TODO: support multiple WHOIS users
2049 if i := strings.IndexByte(mask, ','); i >= 0 {
2050 mask = mask[:i]
2051 }
2052
2053 if dc.network == nil && casemapASCII(mask) == dc.nickCM {
2054 dc.SendMessage(&irc.Message{
2055 Prefix: dc.srv.prefix(),
2056 Command: irc.RPL_WHOISUSER,
2057 Params: []string{dc.nick, dc.nick, dc.user.Username, dc.hostname, "*", dc.realname},
2058 })
2059 dc.SendMessage(&irc.Message{
2060 Prefix: dc.srv.prefix(),
2061 Command: irc.RPL_WHOISSERVER,
2062 Params: []string{dc.nick, dc.nick, dc.srv.Config().Hostname, "soju"},
2063 })
2064 if dc.user.Admin {
2065 dc.SendMessage(&irc.Message{
2066 Prefix: dc.srv.prefix(),
2067 Command: irc.RPL_WHOISOPERATOR,
2068 Params: []string{dc.nick, dc.nick, "is a bouncer administrator"},
2069 })
2070 }
2071 dc.SendMessage(&irc.Message{
2072 Prefix: dc.srv.prefix(),
2073 Command: rpl_whoisaccount,
2074 Params: []string{dc.nick, dc.nick, dc.user.Username, "is logged in as"},
2075 })
2076 dc.SendMessage(&irc.Message{
2077 Prefix: dc.srv.prefix(),
2078 Command: irc.RPL_ENDOFWHOIS,
2079 Params: []string{dc.nick, dc.nick, "End of /WHOIS list"},
2080 })
2081 return nil
2082 }
2083 if casemapASCII(mask) == serviceNickCM {
2084 dc.SendMessage(&irc.Message{
2085 Prefix: dc.srv.prefix(),
2086 Command: irc.RPL_WHOISUSER,
2087 Params: []string{dc.nick, serviceNick, servicePrefix.User, servicePrefix.Host, "*", serviceRealname},
2088 })
2089 dc.SendMessage(&irc.Message{
2090 Prefix: dc.srv.prefix(),
2091 Command: irc.RPL_WHOISSERVER,
2092 Params: []string{dc.nick, serviceNick, dc.srv.Config().Hostname, "soju"},
2093 })
2094 dc.SendMessage(&irc.Message{
2095 Prefix: dc.srv.prefix(),
2096 Command: irc.RPL_WHOISOPERATOR,
2097 Params: []string{dc.nick, serviceNick, "is the bouncer service"},
2098 })
2099 dc.SendMessage(&irc.Message{
2100 Prefix: dc.srv.prefix(),
2101 Command: rpl_whoisaccount,
2102 Params: []string{dc.nick, serviceNick, serviceNick, "is logged in as"},
2103 })
2104 dc.SendMessage(&irc.Message{
2105 Prefix: dc.srv.prefix(),
2106 Command: irc.RPL_ENDOFWHOIS,
2107 Params: []string{dc.nick, serviceNick, "End of /WHOIS list"},
2108 })
2109 return nil
2110 }
2111
2112 // TODO: support WHOIS masks
2113 uc, upstreamNick, err := dc.unmarshalEntity(mask)
2114 if err != nil {
2115 return err
2116 }
2117
2118 var params []string
2119 if target != "" {
2120 if target == mask { // WHOIS nick nick
2121 params = []string{upstreamNick, upstreamNick}
2122 } else {
2123 params = []string{target, upstreamNick}
2124 }
2125 } else {
2126 params = []string{upstreamNick}
2127 }
2128
2129 uc.SendMessageLabeled(dc.id, &irc.Message{
2130 Command: "WHOIS",
2131 Params: params,
2132 })
2133 case "PRIVMSG", "NOTICE":
2134 var targetsStr, text string
2135 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
2136 return err
2137 }
2138 tags := copyClientTags(msg.Tags)
2139
2140 for _, name := range strings.Split(targetsStr, ",") {
2141 if name == "$"+dc.srv.Config().Hostname || (name == "$*" && dc.network == nil) {
2142 // "$" means a server mask follows. If it's the bouncer's
2143 // hostname, broadcast the message to all bouncer users.
2144 if !dc.user.Admin {
2145 return ircError{&irc.Message{
2146 Prefix: dc.srv.prefix(),
2147 Command: irc.ERR_BADMASK,
2148 Params: []string{dc.nick, name, "Permission denied to broadcast message to all bouncer users"},
2149 }}
2150 }
2151
2152 dc.logger.Printf("broadcasting bouncer-wide %v: %v", msg.Command, text)
2153
2154 broadcastTags := tags.Copy()
2155 broadcastTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
2156 broadcastMsg := &irc.Message{
2157 Tags: broadcastTags,
2158 Prefix: servicePrefix,
2159 Command: msg.Command,
2160 Params: []string{name, text},
2161 }
2162 dc.srv.forEachUser(func(u *user) {
2163 u.events <- eventBroadcast{broadcastMsg}
2164 })
2165 continue
2166 }
2167
2168 if dc.network == nil && casemapASCII(name) == dc.nickCM {
2169 dc.SendMessage(&irc.Message{
2170 Tags: msg.Tags.Copy(),
2171 Prefix: dc.prefix(),
2172 Command: msg.Command,
2173 Params: []string{name, text},
2174 })
2175 continue
2176 }
2177
2178 if msg.Command == "PRIVMSG" && casemapASCII(name) == serviceNickCM {
2179 if dc.caps["echo-message"] {
2180 echoTags := tags.Copy()
2181 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
2182 dc.SendMessage(&irc.Message{
2183 Tags: echoTags,
2184 Prefix: dc.prefix(),
2185 Command: msg.Command,
2186 Params: []string{name, text},
2187 })
2188 }
2189 handleServicePRIVMSG(ctx, dc, text)
2190 continue
2191 }
2192
2193 uc, upstreamName, err := dc.unmarshalEntity(name)
2194 if err != nil {
2195 return err
2196 }
2197
2198 if msg.Command == "PRIVMSG" && uc.network.casemap(upstreamName) == "nickserv" {
2199 dc.handleNickServPRIVMSG(ctx, uc, text)
2200 }
2201
2202 unmarshaledText := text
2203 if uc.isChannel(upstreamName) {
2204 unmarshaledText = dc.unmarshalText(uc, text)
2205 }
2206 uc.SendMessageLabeled(dc.id, &irc.Message{
2207 Tags: tags,
2208 Command: msg.Command,
2209 Params: []string{upstreamName, unmarshaledText},
2210 })
2211
2212 echoTags := tags.Copy()
2213 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
2214 if uc.account != "" {
2215 echoTags["account"] = irc.TagValue(uc.account)
2216 }
2217 echoMsg := &irc.Message{
2218 Tags: echoTags,
2219 Prefix: &irc.Prefix{Name: uc.nick},
2220 Command: msg.Command,
2221 Params: []string{upstreamName, text},
2222 }
2223 uc.produce(upstreamName, echoMsg, dc)
2224
2225 uc.updateChannelAutoDetach(upstreamName)
2226 }
2227 case "TAGMSG":
2228 var targetsStr string
2229 if err := parseMessageParams(msg, &targetsStr); err != nil {
2230 return err
2231 }
2232 tags := copyClientTags(msg.Tags)
2233
2234 for _, name := range strings.Split(targetsStr, ",") {
2235 if dc.network == nil && casemapASCII(name) == dc.nickCM {
2236 dc.SendMessage(&irc.Message{
2237 Tags: msg.Tags.Copy(),
2238 Prefix: dc.prefix(),
2239 Command: "TAGMSG",
2240 Params: []string{name},
2241 })
2242 continue
2243 }
2244
2245 if casemapASCII(name) == serviceNickCM {
2246 continue
2247 }
2248
2249 uc, upstreamName, err := dc.unmarshalEntity(name)
2250 if err != nil {
2251 return err
2252 }
2253 if _, ok := uc.caps["message-tags"]; !ok {
2254 continue
2255 }
2256
2257 uc.SendMessageLabeled(dc.id, &irc.Message{
2258 Tags: tags,
2259 Command: "TAGMSG",
2260 Params: []string{upstreamName},
2261 })
2262
2263 uc.updateChannelAutoDetach(upstreamName)
2264 }
2265 case "INVITE":
2266 var user, channel string
2267 if err := parseMessageParams(msg, &user, &channel); err != nil {
2268 return err
2269 }
2270
2271 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
2272 if err != nil {
2273 return err
2274 }
2275
2276 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
2277 if err != nil {
2278 return err
2279 }
2280
2281 if ucChannel != ucUser {
2282 return ircError{&irc.Message{
2283 Command: irc.ERR_USERNOTINCHANNEL,
2284 Params: []string{dc.nick, user, channel, "They are on another network"},
2285 }}
2286 }
2287 uc := ucChannel
2288
2289 uc.SendMessageLabeled(dc.id, &irc.Message{
2290 Command: "INVITE",
2291 Params: []string{upstreamUser, upstreamChannel},
2292 })
2293 case "MONITOR":
2294 // MONITOR is unsupported in multi-upstream mode
2295 uc := dc.upstream()
2296 if uc == nil {
2297 return newUnknownCommandError(msg.Command)
2298 }
2299
2300 var subcommand string
2301 if err := parseMessageParams(msg, &subcommand); err != nil {
2302 return err
2303 }
2304
2305 switch strings.ToUpper(subcommand) {
2306 case "+", "-":
2307 var targets string
2308 if err := parseMessageParams(msg, nil, &targets); err != nil {
2309 return err
2310 }
2311 for _, target := range strings.Split(targets, ",") {
2312 if subcommand == "+" {
2313 // Hard limit, just to avoid having downstreams fill our map
2314 if len(dc.monitored.innerMap) >= 1000 {
2315 dc.SendMessage(&irc.Message{
2316 Prefix: dc.srv.prefix(),
2317 Command: irc.ERR_MONLISTFULL,
2318 Params: []string{dc.nick, "1000", target, "Bouncer monitor list is full"},
2319 })
2320 continue
2321 }
2322
2323 dc.monitored.SetValue(target, nil)
2324
2325 if uc.monitored.Has(target) {
2326 cmd := irc.RPL_MONOFFLINE
2327 if online := uc.monitored.Value(target); online {
2328 cmd = irc.RPL_MONONLINE
2329 }
2330
2331 dc.SendMessage(&irc.Message{
2332 Prefix: dc.srv.prefix(),
2333 Command: cmd,
2334 Params: []string{dc.nick, target},
2335 })
2336 }
2337 } else {
2338 dc.monitored.Delete(target)
2339 }
2340 }
2341 uc.updateMonitor()
2342 case "C": // clear
2343 dc.monitored = newCasemapMap(0)
2344 uc.updateMonitor()
2345 case "L": // list
2346 // TODO: be less lazy and pack the list
2347 for _, entry := range dc.monitored.innerMap {
2348 dc.SendMessage(&irc.Message{
2349 Prefix: dc.srv.prefix(),
2350 Command: irc.RPL_MONLIST,
2351 Params: []string{dc.nick, entry.originalKey},
2352 })
2353 }
2354 dc.SendMessage(&irc.Message{
2355 Prefix: dc.srv.prefix(),
2356 Command: irc.RPL_ENDOFMONLIST,
2357 Params: []string{dc.nick, "End of MONITOR list"},
2358 })
2359 case "S": // status
2360 // TODO: be less lazy and pack the lists
2361 for _, entry := range dc.monitored.innerMap {
2362 target := entry.originalKey
2363
2364 cmd := irc.RPL_MONOFFLINE
2365 if online := uc.monitored.Value(target); online {
2366 cmd = irc.RPL_MONONLINE
2367 }
2368
2369 dc.SendMessage(&irc.Message{
2370 Prefix: dc.srv.prefix(),
2371 Command: cmd,
2372 Params: []string{dc.nick, target},
2373 })
2374 }
2375 }
2376 case "CHATHISTORY":
2377 var subcommand string
2378 if err := parseMessageParams(msg, &subcommand); err != nil {
2379 return err
2380 }
2381 var target, limitStr string
2382 var boundsStr [2]string
2383 switch subcommand {
2384 case "AFTER", "BEFORE":
2385 if err := parseMessageParams(msg, nil, &target, &boundsStr[0], &limitStr); err != nil {
2386 return err
2387 }
2388 case "BETWEEN":
2389 if err := parseMessageParams(msg, nil, &target, &boundsStr[0], &boundsStr[1], &limitStr); err != nil {
2390 return err
2391 }
2392 case "TARGETS":
2393 if dc.network == nil {
2394 // Either an unbound bouncer network, in which case we should return no targets,
2395 // or a multi-upstream downstream, but we don't support CHATHISTORY TARGETS for those yet.
2396 dc.SendBatch("draft/chathistory-targets", nil, nil, func(batchRef irc.TagValue) {})
2397 return nil
2398 }
2399 if err := parseMessageParams(msg, nil, &boundsStr[0], &boundsStr[1], &limitStr); err != nil {
2400 return err
2401 }
2402 default:
2403 // TODO: support LATEST, AROUND
2404 return ircError{&irc.Message{
2405 Command: "FAIL",
2406 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, "Unknown command"},
2407 }}
2408 }
2409
2410 // We don't save history for our service
2411 if casemapASCII(target) == serviceNickCM {
2412 dc.SendBatch("chathistory", []string{target}, nil, func(batchRef irc.TagValue) {})
2413 return nil
2414 }
2415
2416 store, ok := dc.user.msgStore.(chatHistoryMessageStore)
2417 if !ok {
2418 return ircError{&irc.Message{
2419 Command: irc.ERR_UNKNOWNCOMMAND,
2420 Params: []string{dc.nick, "CHATHISTORY", "Unknown command"},
2421 }}
2422 }
2423
2424 network, entity, err := dc.unmarshalEntityNetwork(target)
2425 if err != nil {
2426 return err
2427 }
2428 entity = network.casemap(entity)
2429
2430 // TODO: support msgid criteria
2431 var bounds [2]time.Time
2432 bounds[0] = parseChatHistoryBound(boundsStr[0])
2433 if bounds[0].IsZero() {
2434 return ircError{&irc.Message{
2435 Command: "FAIL",
2436 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, boundsStr[0], "Invalid first bound"},
2437 }}
2438 }
2439
2440 if boundsStr[1] != "" {
2441 bounds[1] = parseChatHistoryBound(boundsStr[1])
2442 if bounds[1].IsZero() {
2443 return ircError{&irc.Message{
2444 Command: "FAIL",
2445 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, boundsStr[1], "Invalid second bound"},
2446 }}
2447 }
2448 }
2449
2450 limit, err := strconv.Atoi(limitStr)
2451 if err != nil || limit < 0 || limit > chatHistoryLimit {
2452 return ircError{&irc.Message{
2453 Command: "FAIL",
2454 Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, limitStr, "Invalid limit"},
2455 }}
2456 }
2457
2458 eventPlayback := dc.caps["draft/event-playback"]
2459
2460 var history []*irc.Message
2461 switch subcommand {
2462 case "BEFORE":
2463 history, err = store.LoadBeforeTime(ctx, &network.Network, entity, bounds[0], time.Time{}, limit, eventPlayback)
2464 case "AFTER":
2465 history, err = store.LoadAfterTime(ctx, &network.Network, entity, bounds[0], time.Now(), limit, eventPlayback)
2466 case "BETWEEN":
2467 if bounds[0].Before(bounds[1]) {
2468 history, err = store.LoadAfterTime(ctx, &network.Network, entity, bounds[0], bounds[1], limit, eventPlayback)
2469 } else {
2470 history, err = store.LoadBeforeTime(ctx, &network.Network, entity, bounds[0], bounds[1], limit, eventPlayback)
2471 }
2472 case "TARGETS":
2473 // TODO: support TARGETS in multi-upstream mode
2474 targets, err := store.ListTargets(ctx, &network.Network, bounds[0], bounds[1], limit, eventPlayback)
2475 if err != nil {
2476 dc.logger.Printf("failed fetching targets for chathistory: %v", err)
2477 return ircError{&irc.Message{
2478 Command: "FAIL",
2479 Params: []string{"CHATHISTORY", "MESSAGE_ERROR", subcommand, "Failed to retrieve targets"},
2480 }}
2481 }
2482
2483 dc.SendBatch("draft/chathistory-targets", nil, nil, func(batchRef irc.TagValue) {
2484 for _, target := range targets {
2485 if ch := network.channels.Value(target.Name); ch != nil && ch.Detached {
2486 continue
2487 }
2488
2489 dc.SendMessage(&irc.Message{
2490 Tags: irc.Tags{"batch": batchRef},
2491 Prefix: dc.srv.prefix(),
2492 Command: "CHATHISTORY",
2493 Params: []string{"TARGETS", target.Name, target.LatestMessage.UTC().Format(serverTimeLayout)},
2494 })
2495 }
2496 })
2497
2498 return nil
2499 }
2500 if err != nil {
2501 dc.logger.Printf("failed fetching %q messages for chathistory: %v", target, err)
2502 return newChatHistoryError(subcommand, target)
2503 }
2504
2505 dc.SendBatch("chathistory", []string{target}, nil, func(batchRef irc.TagValue) {
2506 for _, msg := range history {
2507 msg.Tags["batch"] = batchRef
2508 dc.SendMessage(dc.marshalMessage(msg, network))
2509 }
2510 })
2511 case "BOUNCER":
2512 var subcommand string
2513 if err := parseMessageParams(msg, &subcommand); err != nil {
2514 return err
2515 }
2516
2517 switch strings.ToUpper(subcommand) {
2518 case "BIND":
2519 return ircError{&irc.Message{
2520 Command: "FAIL",
2521 Params: []string{"BOUNCER", "REGISTRATION_IS_COMPLETED", "BIND", "Cannot bind to a network after registration"},
2522 }}
2523 case "LISTNETWORKS":
2524 dc.SendBatch("soju.im/bouncer-networks", nil, nil, func(batchRef irc.TagValue) {
2525 dc.user.forEachNetwork(func(network *network) {
2526 idStr := fmt.Sprintf("%v", network.ID)
2527 attrs := getNetworkAttrs(network)
2528 dc.SendMessage(&irc.Message{
2529 Tags: irc.Tags{"batch": batchRef},
2530 Prefix: dc.srv.prefix(),
2531 Command: "BOUNCER",
2532 Params: []string{"NETWORK", idStr, attrs.String()},
2533 })
2534 })
2535 })
2536 case "ADDNETWORK":
2537 var attrsStr string
2538 if err := parseMessageParams(msg, nil, &attrsStr); err != nil {
2539 return err
2540 }
2541 attrs := irc.ParseTags(attrsStr)
2542
2543 record := &Network{Nick: dc.nick, Enabled: true}
2544 if err := updateNetworkAttrs(record, attrs, subcommand); err != nil {
2545 return err
2546 }
2547
2548 if record.Nick == dc.user.Username {
2549 record.Nick = ""
2550 }
2551 if record.Realname == dc.user.Realname {
2552 record.Realname = ""
2553 }
2554
2555 network, err := dc.user.createNetwork(ctx, record)
2556 if err != nil {
2557 return ircError{&irc.Message{
2558 Command: "FAIL",
2559 Params: []string{"BOUNCER", "UNKNOWN_ERROR", subcommand, fmt.Sprintf("Failed to create network: %v", err)},
2560 }}
2561 }
2562
2563 dc.SendMessage(&irc.Message{
2564 Prefix: dc.srv.prefix(),
2565 Command: "BOUNCER",
2566 Params: []string{"ADDNETWORK", fmt.Sprintf("%v", network.ID)},
2567 })
2568 case "CHANGENETWORK":
2569 var idStr, attrsStr string
2570 if err := parseMessageParams(msg, nil, &idStr, &attrsStr); err != nil {
2571 return err
2572 }
2573 id, err := parseBouncerNetID(subcommand, idStr)
2574 if err != nil {
2575 return err
2576 }
2577 attrs := irc.ParseTags(attrsStr)
2578
2579 net := dc.user.getNetworkByID(id)
2580 if net == nil {
2581 return ircError{&irc.Message{
2582 Command: "FAIL",
2583 Params: []string{"BOUNCER", "INVALID_NETID", subcommand, idStr, "Invalid network ID"},
2584 }}
2585 }
2586
2587 record := net.Network // copy network record because we'll mutate it
2588 if err := updateNetworkAttrs(&record, attrs, subcommand); err != nil {
2589 return err
2590 }
2591
2592 if record.Nick == dc.user.Username {
2593 record.Nick = ""
2594 }
2595 if record.Realname == dc.user.Realname {
2596 record.Realname = ""
2597 }
2598
2599 _, err = dc.user.updateNetwork(ctx, &record)
2600 if err != nil {
2601 return ircError{&irc.Message{
2602 Command: "FAIL",
2603 Params: []string{"BOUNCER", "UNKNOWN_ERROR", subcommand, fmt.Sprintf("Failed to update network: %v", err)},
2604 }}
2605 }
2606
2607 dc.SendMessage(&irc.Message{
2608 Prefix: dc.srv.prefix(),
2609 Command: "BOUNCER",
2610 Params: []string{"CHANGENETWORK", idStr},
2611 })
2612 case "DELNETWORK":
2613 var idStr string
2614 if err := parseMessageParams(msg, nil, &idStr); err != nil {
2615 return err
2616 }
2617 id, err := parseBouncerNetID(subcommand, idStr)
2618 if err != nil {
2619 return err
2620 }
2621
2622 net := dc.user.getNetworkByID(id)
2623 if net == nil {
2624 return ircError{&irc.Message{
2625 Command: "FAIL",
2626 Params: []string{"BOUNCER", "INVALID_NETID", subcommand, idStr, "Invalid network ID"},
2627 }}
2628 }
2629
2630 if err := dc.user.deleteNetwork(ctx, net.ID); err != nil {
2631 return err
2632 }
2633
2634 dc.SendMessage(&irc.Message{
2635 Prefix: dc.srv.prefix(),
2636 Command: "BOUNCER",
2637 Params: []string{"DELNETWORK", idStr},
2638 })
2639 default:
2640 return ircError{&irc.Message{
2641 Command: "FAIL",
2642 Params: []string{"BOUNCER", "UNKNOWN_COMMAND", subcommand, "Unknown subcommand"},
2643 }}
2644 }
2645 default:
2646 dc.logger.Printf("unhandled message: %v", msg)
2647
2648 // Only forward unknown commands in single-upstream mode
2649 uc := dc.upstream()
2650 if uc == nil {
2651 return newUnknownCommandError(msg.Command)
2652 }
2653
2654 uc.SendMessageLabeled(dc.id, msg)
2655 }
2656 return nil
2657}
2658
2659func (dc *downstreamConn) handleNickServPRIVMSG(ctx context.Context, uc *upstreamConn, text string) {
2660 username, password, ok := parseNickServCredentials(text, uc.nick)
2661 if !ok {
2662 return
2663 }
2664
2665 // User may have e.g. EXTERNAL mechanism configured. We do not want to
2666 // automatically erase the key pair or any other credentials.
2667 if uc.network.SASL.Mechanism != "" && uc.network.SASL.Mechanism != "PLAIN" {
2668 return
2669 }
2670
2671 dc.logger.Printf("auto-saving NickServ credentials with username %q", username)
2672 n := uc.network
2673 n.SASL.Mechanism = "PLAIN"
2674 n.SASL.Plain.Username = username
2675 n.SASL.Plain.Password = password
2676 if err := dc.srv.db.StoreNetwork(ctx, dc.user.ID, &n.Network); err != nil {
2677 dc.logger.Printf("failed to save NickServ credentials: %v", err)
2678 }
2679}
2680
2681func parseNickServCredentials(text, nick string) (username, password string, ok bool) {
2682 fields := strings.Fields(text)
2683 if len(fields) < 2 {
2684 return "", "", false
2685 }
2686 cmd := strings.ToUpper(fields[0])
2687 params := fields[1:]
2688 switch cmd {
2689 case "REGISTER":
2690 username = nick
2691 password = params[0]
2692 case "IDENTIFY":
2693 if len(params) == 1 {
2694 username = nick
2695 password = params[0]
2696 } else {
2697 username = params[0]
2698 password = params[1]
2699 }
2700 case "SET":
2701 if len(params) == 2 && strings.EqualFold(params[0], "PASSWORD") {
2702 username = nick
2703 password = params[1]
2704 }
2705 default:
2706 return "", "", false
2707 }
2708 return username, password, true
2709}
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